Collet holder



FIG. 1 is a top plan view of a collet holder showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view of a modified form of the collet holder described in FIG. 1 showing my new design; and

FIG. 5 is a left side elevational view of a modified form of the collet holder described in FIG. 1 showing my new design;

The side opposite to the side shown in FIG. 1 _is identical to that figure. The top plan view and the right side elevational view of FIGS. 4 and 5 are identical with FIGS. 1 and 3 and the side opposite FIG. 1 is identical therewith. 

The ornamental design for a collet holder, as shown and described. 